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The oscar (Astronotus ocellatus) is a species of fish from the cichlid family known under a variety of common names, including tiger oscar, velvet cichlid, and marble cichlid. [2] In tropical South America, where the species naturally resides, A. ocellatus specimens are often found for sale as a food fish in the local markets.
This fish can range up to 1.5 m (4.9 ft) and weigh 7 kg (15 lb). [73] Seahorses and allies (Syngnathiformes) The largest of this diverse order is the red cornetfish (Fistularia petimba), a long, thin species found in all tropical oceans. This fish can reach a length of 2 m (6.6 ft) and a weight of 4.65 kg (10.3 lb). [73]
Major groups of fish evolved during this period, often referred to as the age of fish. [39] See Category:Devonian fish. D e v o n i a n: Early Devonian: Early Devonian (419–393 Ma): Psarolepis: Psarolepis (speckled scale) is a genus of extinct lobe-finned fish that lived around 397 to 418 Ma.
The idea: Grow the salmon indoors to reduce exposure to parasites, warming waters and algae blooms that threaten the fish grown in farms in open waters near shore — and in turn reduce the fish ...
Contributing between 1 and 10% of total ocean primary productivity, 200 species of coccolithophores live in the ocean, and under the right conditions they can form large blooms. These large bloom formations are a driving force for the export of calcium carbonate from the surface to the deep ocean in what is sometimes called “Coccolith rain”.
The Devonian period (395 to 345 Mya) brought in such giants as the placoderm Dunkleosteus, which could grow up to seven meters long, and early air-breathing fish that could remain on land for extended periods.
On "River Monsters," Jeremy Wade traveled to South America to investigate where a Bolivian man named Oscar was killed when face was ripped off while swimming across the South American River.
Fish afflicted with this condition may struggle to maintain their position in the water, often floating upside-down, sinking to the bottom, or swimming at unusual angles. The causes can be diverse, ranging from overfeeding, constipation, and rapid water temperature changes to physical injury and bacterial infections. [ 9 ]